Rotary cutter



Oct' 14, 1941. M c. ANDERSON ET AL 2,259,0l5

ROTARY CUTTER Filed Dec. 5, 1939 A torneys Patented Oct. 14, 1941 ROTARY CUTTER Marshall C. Anderson and Owen Estes, Hines, Oreg.

Application December 5, 1939, Serial No. 307,681

1 Claim.

. woodwork and has for its primary object to provide, in a manner as hereinafter set forth, a device of this character comprising teeth of a novel construction whereby a very smooth cut may be had, thereby eliminating the necessity of planing the work to obtain a smooth surface.

Another very important object of the invention is to provide a rotary cutter of the aforementionecl character embodying teeth of such construction that the tool will function at comparatively great speed without overheating.

All of the foregoing and still further Vobjects and advantages of the invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing wherein like characters of reference designate corresponding parts throughout the several views, and wherein:

Figure 1 is a view in side elevation of a rotary cutter constructed in accordance with the present invention.

Figure 2 is an edge view thereof.

Figure 3 is a sectional view through one of the teeth, taken substantially on the line 3-3 of Figure 1.

Referring now to the drawing in detail, it will be seen that the embodiment of the invention which has been illustrated comprises a metallic disk having an eye or opening 2 therein. Of course, the disk may be of any suitable diameter. Projecting from the periphery of the disk I are integral teeth 3. The gist of the present invention resdes in the construction and arrangement of the teeth.

The teeth 3 taper from their inner ends or base portions toward their outer ends. The cutter rotates in the direction indicated by the arrow in Figure 1 of the drawing and it will be observed that the teeth 3 are back pitched. The outer ends of the teeth 3 are .rearwardly inclined, as at 4. It will also be noted that the inclined outer or free ends 4 of the teeth 3 are beveled alternately on opposite sides, as at 5.

The leading or entering edges 6 of the teeth 3 are forwardly bowed from the inner ends of said teeth to the outer ends thereof. As illustrated to advantages in Figure 3 of the drawing, the teeth 3 taper in thickness from the leading edges 6 thereof to their rear or trailing edges l.

Briefly, the device functions as follows:

When the outermost points 8 of the teeth 3 enter the work the highest portions of the bowed leading edges 6 have already entered and cut a clearance for said points 8. In this manner the points 8 are prevented from scratching the work. The lback pitch of the teeth also contributes to the smoothness of the work after it has been cut. Further, many experiments have proven that, due to the back pitch of the teeth, the bowed leading edges thereof, the inclination of the alternately beveled outer ends, the taper from front to back, etc., provide a tool capable of Cutting many more lineal feet per minute than cutters in use at present, and this without overheating.

It is believed that the many advantages of a rotary cutter constructed in accordance With the present invention will be readily understood and although a preferred embodiment of the device is as illustrated and described, it is to be understood that changes in the details of construction may be resorted to which will fall within the scope of the invention as claimed.

What is claimed is:

A rotary cutter comprising a disk, back pitched teeth projecting from the periphery of said disk, said teeth tapering in width outwardly and terminating in rearwardly inclined outer ends, said outer ends of the teeth being alternately beveled on opposite sides, said teeth tapering throughout their length from their leading edges to their trailing edges.

MARSHALL C. ANDERSON. OWEN ESTES. 

